Year	% of cohort
1960	61.408599
1961	63.269811
1962	65.614781
1963	61.714408
1964	70.264586
1965	69.939045
1966	69.55713
1967	70.728362
1968	69.133167
1969	67.258297
1970	70.320847
1971	67.199714
1972	73.544771
1973	75.592479
1974	76.564214
1975	77.593762
1976	77.483457
1977	74.705404
1978	78.068951
1979	77.931459
1980	79.653228
1981	82.015568
1982	79.317616
1983	81.100756
1984	78.675967
1985	78.789832
1986	81.827011
1987	80.862818
1988	80.574196
1989	77.543939
1990	77.39689
1991	75.418854
1992	78.020729
1993	79.083472
1994	79.148935
1995	80.529781
1996	79.90256
1997	79.656116
1998	79.123093
1999	78.555032
2000	81.901255
2001	81.496788
2002	82.313788
2003	79.929373
2004	81.401181
2005	82.986585
2006	82.386807
2007	82.370716
2008	84.103189
2009	83.075162
2010	82.919555
2011	80.126696
2012	80.688628
2013	77.894415
2014	79.238614
2015	77.068245
2016	80.305413
2017	74.443269
2018	84.304673
2019	84.183462
2020	84.237165
2021	83.395018
2022	83.507191